David Galloway

If you find yourself constantly needing a bit driver you can build a keyring version by adding a magnetic bit driver designed to be used with a power drill to a carabiner key ring. Simply attach a nut large enough to fit the carabiner to the end of the magnetic bit driver with a little JB Weld.

Instructables user uglymike figured out the method to attach a magnetic bit holder to a carabiner keychain. Once that is done just add a set of keychain driver bits that are available at most hardware stores and you'll always be ready to tighten or loosen a screw.